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在天体力学发现之前,人们的公约是牛顿力学,是经过实践验证过的. :-)
flying_snow
(飞雪浮冰)
(#79185@0)
Last Updated: 2001-5-23
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一个小小的guest权限大家就吵得不可开交，所以领导13亿人口的国家是多么的不易，不当家不知柴米油盐贵呀。
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枫下沙龙
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谈天说地